<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>My JSP 'a.jsp' starting page</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
	<script type="text/javascript">
	    function createXMLHttpRequest() {
	        try {
	            return new XMLHttpRequest();
	        } catch(e) {
	            try {
	                return new ActiveXObject("Msxml2.XMLHTTP");
	            } catch(e) {
	                try {
	                    return new ActiveXObject("Microsoft.XMLHTTP");
	                } catch(e) {
	                    alter("浏览器不兼容！");
	                    throw e;
	                }
	            }
	        }
	    }		
	    
	    window.onload = function() {
	    	var btn = document.getElementById("btn");
	    	btn.onclick = function() {
	    		var xmlHttp = createXMLHttpRequest();
	    		xmlHttp.open("GET", "<c:url value='/ajax/AServlet'/>", true);
	    		xmlHttp.send(null);
	    		xmlHttp.onreadystatechange = function() {
	    			if (xmlHttp.readyState == 4 && xmlHttp.status == 200) {
	    				var content = xmlHttp.responseText;
	    				var h3 = document.getElementById("h3");
	    				h3.innerHTML = content;
	    			}
	    		};
	    	};
	    };
	</script>
  </head>
  
  <body>
	<h1>AJAX 1</h1>
	<input type="button" id="btn" value="获取"/>
	<h3 id="h3"></h3>
  </body>
</html>
